After switching on powerful arc lights, they saw great stalagmites -- some of them over forty feet high -- rising up like tree-trunks to meet the stalactites suspended from the roof.

他们力弧光灯，看见一株株巨大的石笋，有的高达40英尺，象树干似的向上长着，与洞顶悬挂下来的钟乳石相接。

It is seen, therefore, that some agent is capable of penetrating black cardboard, which is quite opaque to ultraviolet light, sunlight or arc light.

因此可以看，某种物质能够穿透黑色硬板，而这种材料对紫外线、阳光或弧光来说却是完全不透明的。

This helmet has auto-darkening lenses that adjust to protect the eyes from strong arc light.

这款头盔具有自动变暗镜片，可调节以保护眼睛免受弧光的伤害。

Turns and runs, out of the circle of the arc light and into the dark.

转身奔, 弧光圈, 进入黑暗。

Tom was eager to see how the man in Connecticut was using electricity to light up his eight arc lights.

汤姆很想看看康涅狄格州的那个人是如何用电来点亮他的八盏弧光灯的。

An arc light makes light when an electric current jumps across the space between two carbon rods.

当电流跃过两个碳棒之间的空间时， 弧光灯就会发光。

He could send enough electricity to light up not just one arc light, but eight.

他发的电能足以点亮一盏弧光灯， 而是八盏。